(2013•广州)分解因式:x2+xy= .
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(2007•泉州)计算:(10
3)
2=
.
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(2007•泉州)将点A(4,0)绕着原点O顺时针方向旋转30°角到对应点A′,则点A′的坐标是( )
A.(
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,2)
B.(4,-2)
C.(2
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,-2)
D.(2,-2
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)
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(2007•泉州)不等式组
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的解集的情况为( )
A.x<-1
B.x<0
C.-1<x<0
D.无解
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(2007•泉州)如图,A、B、C三点都在⊙O上,若∠BOC=80°,则∠A的度数等于( )
A.20°
B.40°
C.60°
D.80°
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(2007•泉州)观察下列图形,其中不是正方体的展开图的为( )
A.
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B.
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C.
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D.
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